Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income	$ 47,697	$ 41,614
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,100	2,848
Deferred income taxes	(3,621)	2,252
Stock-based compensation expense	3,199	2,701
Provision for excess and obsolete inventory	1,069	1,027
Accretion of discounts and premiums on marketable securities	(2,840)
Currency loss on foreign denominated transactions	1,343
Changes in operating assets and liabilities:
Accounts receivable	(20,762)	(15,199)
Inventories	(21,105)	(11,490)
Prepaid expenses and other current assets	(4,794)	(1,852)
Accounts payable and other current liabilities	(22,976)	(3,582)
Deferred revenue	47,160	6,418
Income taxes	8,891	858
Other assets and liabilities	(1,802)	175
Net cash provided by operating activities	34,559	25,770
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(2,240)	(1,503)
Purchase of short-term investments	(61,809)
Maturities of short-term investments	31,000
Net cash used in investing activities	(33,049)	(1,503)
Cash flows from financing activities
Net settlement on restricted stock grants	(3,907)	(3,315)
Repurchase of common stock	(12,499)	(20,000)
Principal payments on finance lease obligation	(289)	(229)
Proceeds from exercise of stock options	25	491
Net cash used in financing activities	(16,670)	(23,053)
Effect of exchange rate changes on cash and cash equivalents	(55)	1,002
Net increase in cash, cash equivalents and restricted cash	(15,215)	2,216
Cash, cash equivalents and restricted cash at beginning of period	186,347	295,680
Cash, cash equivalents and restricted cash at end of period	$ 171,132	$ 297,896